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The Fuji Racing Coolant mod for the Subaru EJ Series Engines was designed to get rid of the coolant passage 'dead spot' which is located over cylinder 4. It has the correct size restrictor built into the pipe to allow for optimal flow without over cooling the coolant system.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.